How do I get excel to represent any given day of the week as it occurd during the month. For example:

4/1/2005 = 1st week of the month
4/2/2005 = 1st week of the month
4/3/2005 = 2nd week of the month
4/4/2005 = 2nd week of the month

On the calendar 4/1/2005 and 4/2/2005 are on a Friday and Saturday. I want my formula to say these dates equal "1" and 4/3/2005 for example equals "2' I want to be able to do this for any month. Thank you all very much for any help.